Diode measurement of Pen type Digital multimter GD109
◆Press the button to turn on the power of the instrument,
◆Press the "FUNC" key to select the "diode" gear.
◆Insert the red test lead to the "INPUT" input terminal, and the black test lead to the "COM" input terminal.
◆Connect the red probe to the anode of the diode under test and the black probe to the cathode.
◆Read the forward bias value on the display.
If the electrode of the test lead is reversed to the electrode of the diode, the display will read OL, which can be used to distinguish the anode and cathode of the diode.
